Threshold Voltage Sensing in Display Driving Transistors
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Solution Overview
Problem
In organic light-emitting display devices, luminance deviations between subpixels occur due to variations in transistor characteristics, particularly threshold voltage and mobility, leading to image quality deterioration, and existing sensing and compensation methods are time-consuming.
Innovation Solution
A method for sensing and compensating the threshold voltage of driving transistors by generating sensing voltages during a mobility sensing period, using a display device with a gate driving circuit, data driving circuit, and a controller to calculate the threshold voltage from multiple sensing values of driving current, thereby shortening the sensing and compensation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If threshold voltage sensing is performed by waiting for saturation state, then measurement accuracy is improved, but sensing time increases
Solution Approach 1:
The patent applies preliminary action by performing threshold voltage sensing during the mobility sensing period, which occurs before the traditional threshold voltage sensing would be performed. By utilizing the blank period and performing sensing operations in advance (during mobility sensing), the patent eliminates the need to wait for saturation state, thereby reducing sensing time while maintaining measurement accuracy through the use of multiple sensing values and calculation algorithms.
2Measurement precision
If multiple sensing values are used to calculate threshold voltage, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the sensing circuit to perform multiple functions: it senses both mobility characteristics and threshold voltage characteristics using the same hardware infrastructure. The data driving circuit and controller are configured to generate and process multiple sensing values during the mobility sensing period, enabling dual-purpose measurement without requiring separate dedicated circuits for each type of sensing operation.
Data Source
AI summary
The present disclosure generally relates to a method of sensing characteristic value of circuit element and display device using it, which may shorten the threshold voltage sensing and compensation time of the driving transistor and the threshold voltage compensation time driving transistors by sensing the threshold voltage in a mobility sensing period of the driving transistor, calculate the threshold voltage using two or more sensing values of driving current for the driving transistor.